Bi Jun Luo

Research on Controllable Synthesis of Magnesium Carbonate Tri-Hydrate

In order to promote the comprehensive utilization of salt lake brine resources, magnesium carbonate tri-hydrate (MgCO3·3H2O) was synthetized by low-temperature hydrothermal technique using purified MgCl2-rich brine and ammonium hydrogen carbonate solution as raw materials, the orthogonal experimental as method. The morphology could be tuned by changing the operating parameters. X-ray diffraction (XRD) and scanning electron microscope (SEM) were used to characterize the structures and morphologies of the products. The results show that the optimum conditions are as follows : reaction temperature is 40-50°C, n (Mg2+):n (HCO3-)=1:2.2, pH value is 8.8-9.0, stirring speed is 130 r/min, aging time is 3h, reaction time is 70 min. Magnesium carbonate tri-hydrate synthetized is one-dimensional acicular with good settling performance. Average aspect ratio could up to 29.60.

Progress of High Purity Magnesium Oxide Preparation

The research status of high purity magnesium oxide preparation is introduced in this paper. First, process for preparing high purity MgO is summarized, the global and domestic production status of high purity magnesia is also described. Finally, the problems and disadvantages of current MgO preparation methods are concluded, also development direction of preparation method basing on brine utilization in the production of MgO is put forward.

Research Progress of High Quality Silicon Steel Magnesium Oxide

Silicon steel magnesium oxide is a coating material used for preparing oriented silicon steel. In this paper, The preparation methods of silicon steel magnesium oxide and research progress of high quality silicon steel magnesium oxide preparation technology were introduced. The use of abundant brine resources in the preparation of silicon steel magnesium oxide was prospected.

Research on Crystallization Kinetics of Calcium Sulfate Dihydrate Prepared by Bittern under 20°C and 120r/min Condition

Crystallization kinetics experiment of calcium sulfate dehydrates, which is prepared by bittern under 20°C and 120r/min conditions, is carried out. According to the results of the experimental data, nucleation density n0 of gypsum crystals is proportional to the residence time, and the rate of crystal growth line G is inversely proportional to the residence time. Meanwhile, the crystallization kinetics formula is derived to be: B0 = 5.78×102G0.87.

Study of Crystallizer 3D Modelling Based on Fluent and its Application in Production of Gypsum

The research status of crystallization process and crystallizer of gypsum is introduced in this paper. Progress in 3D mathematical simulation of crystallizer based on Fluent is summarized, and the application of the 3D model in the construction and optimization analysis is also described. Furthermore, the prospect of Fluent applied in the design and optimization of gypsum crystallizer is introduced. Finally, the potential and prospect of Fluent basing on the 3D mathematical simulation of crystallizer in the production of gypsum is put forward.

Research Progress of Magnesium Hydroxide Flame Retardant from Concentrated Seawater and Brine

Magnesium hydroxide is an environmental friendly flame retardant with high flame retardancy and low smoke non-toxic characteristics. In this paper, the flame retardant effects of magnesium hydroxide was introduced, the production application and technology experiment of magnesium hydroxide flame retardant was studied. Meanwhile, the development trend of magnesium hydroxide flame retardant prepared from concentrated seawater or brine in China was analyzed.